Locking block for guarding carburetor jet screws



NOV. 18, 1952 WHITFORD 2,618,473

LOCKING BLOCK FOR GUARDING CARBURETOR JET SCREWS Filed Feb. 9, 1951 32 l8 "1 m I 2a 22 L 2 e2 1 W W-Q' 1 m \V a'z ogaoj 22 Frq", a

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% drroe/vzv Patented Nov. 18, 1952 UNITED STATES PATENT OFFICE LOCKING BLOCK FOR GUARDING CARBURETOR JET SCREWS 1 Claim.

This invention relates to a new and improved guard block or look device for the carburetor jet screws of a twin type carburetor of the class having a pair of jet screws, particularly for the gas intake adjustment.

It often happens that the jet screws become dislodged from their correct settings either by accident or intent, to greatly increase gasoline consumption, and it is the principal object of this invention to provide means for preventing either the accidental or malicious maladjustment of these screws; another object of the invention resides in the provision of a block having a pair of spaced parallel bores or depressions therein, the spacing thereof being equal to the spacing of the twin jet screws of a carburetor having the same, the knobs of the jet screws being receivable in said bores, each of which is provided with a set screw which may be turned quickly to engage the knob of the jet screw and thereby H lock the block in position, the block then providing that the jet screws may not be turned in either direction.

A further object of the invention resides in the provision of a device as above described which is prevented from rotation, and therefore prevented from maladjustment of a jet screw received therein, by reason of being secured to a projection or the like, which may be another jet screw as described above.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings in which Fig. 1 is a view in front elevation of a carburetor having the new carburetor jet screw guard block attached thereto;

Fig. 2 is an enlarged view in section on line 2-2 of Fig. 1 and showing the guard block in plan;

Fig. 3 is a section on line 83 of Fig. 2 and Fig. 4 is an enlarged view partly in section of the new guard block.

As shown in Fig. 1 there is a carburetor indicated generally by the numeral it. This carburetor may be of usual construction since it is intended that the guard block of the present invention is to be secured to the carburetor already installed on existing vehicle engines.

The important parts of the carburetor with relation to this invention reside in a housing providing a pair of chambers l2 and it, and gas ducts l6 and H3 at the exterior of the chambers l2 and l 4. Each duct leads into its respective chamber through a reduced conical passage at 29 and this passage is varied in size of aperture by means of a let screw 22 which is threaded in a boss 24 for adjustment thereof to vary the size of the passage 20, all as well known in the art.

Each jet screw 22 is provided with a knob 26 by which it is easily manually turned and, of course, it is obvious that whenever the hood of the vehicle engine is raised, either or both of these knobs may be easily and quickly turned without the knowledge of the owner of the vehicle.

In order to prevent such relatively easy adjustment or maladjustment, there is provided a locking block generally indicated at 28, said block having a pair of bores 38 therein arranged parallel to each other and spaced apart the distance between the two jet screws 22. The spacing of the block 28 may, of course, be as desired and could even be made adjustable. Each bore 38 is provided with a set screw or the like 32 for lightly engaging the respective knob 28 to hold the locking block 28 in position on the two jet screws so that it cannot be manually removed without the application of a tool.

It is obvious that the jet screws cannot be turned at all because block 28 cannot be turned since it is directly secured to the two knobs. Also, the block cannot be removed without the use of a tool and, of course, such activity on the part of the person attempting to accomplish it, would be quickly recognized by the owner of the vehicle. This device may be used with only one jet screw in the event that some other fixed part of the engine or the carburetor itself is receivable into the bore 38 not being occupied by the single jet screw. The important part is that the locking block 28 cannot be rotated and it would, of course, be quite useless to cover merely one of the knobs without anchoring the covering or locking means, since the unanchored cover could be turned.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed otherwise than as set forth in the claim, but what I claim is:

The combination of a carburetor having two jets and a jet adjusting screw for each jet, each screw having a portion extending from the carburetor in exposed condition for adjustment, with a recessed solid and rigid block receiving the exposed portions of both screws at the same time, and two screw means in the block each inter secting a recess therein and aligned with the said exposed portions of the jet adjusting screws housed in the block to secure the jet adjusting screws in adjusted position and preventing any further adjustment of either jet adjusting screw without loosening both screw means and completely removing the block from the jet adjusting screws.

ALBERT EDWARD WHITFORD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 793,419 Cole June 27, 1905 1,038,183 Mueller Sept. 10, 1912 1,283,957 Sumner Nov. 5, 1918 1,973 658 Bedding Sept. 11, 1934 

